引言 光纤技术的开发与应用业已成为当代最活跃的技术领域。迄今为止。人们通常是将光纤用作传输信号的媒介或传感元件。在光纤通信及光信息网等项应用中,因光纤具有损耗及色散,为了延伸传输距离,在系统中必须配备中继转发器。近年来研究光纤中光信号放大的基本理论与技术并利用这类机理研制光纤放大器的工作引起国内外学越来越多的关注与重视。在光纤放大器中, Introduction The development and application of optical fiber technology has become the most active technology field in the world. So far. People often use optical fibers as a medium or sensor for transmitting signals. In optical fiber communication and optical information network and other applications, due to optical fiber loss and dispersion, in order to extend the transmission distance, in the system must be equipped with repeaters. In recent years, the basic theory and technology of optical signal amplification in optical fiber and the development of optical fiber amplifier by using such mechanism have drawn more and more attention and attention from domestic and foreign scholars. In fiber amplifiers,